FAMILIAR FARM ENEMIES 
283 
many of these will soon destroy a tree. Spraying with 
a strong solution of lime sulphur during the winter will 
destroy scales. 
Weevils are perhaps very destructive to stored grains 
and seeds. The larvae or worms live inside the seed 
coat, destroying the stored food. The pea weevils cause 
great losses to millers by spoiling flour and meal. Car¬ 
bon disulphide in a closed bin will destroy weevil. 
Butterflies and Moths of many kinds lay eggs which 
hatch into caterpillars and worms. Cabbage worms, cut¬ 
worms, army worms, bag-worms, caterpillars, and silk 
worms are common members of this group. Most of 
these worms eat leaves and may be poisoned by the use 
of arsenate of lead or Paris green. 
Grasshoppers and crickets do much damage in the 
field by eating grass and growing crops. Such multi¬ 
tudes often appear that whole fields are devastated. 
These may be destroyed by mixing Paris green and bran, 
and broadcasting it over the field. 
QUESTIONS 
1. What is a weed? Insect? 
2. Name eight enemies of farm crops. 
3. Of what importance is the study of weeds and insects to 
practical farmers? 
4. Why are weeds valuable to farmers? 
5. Name four common weeds that you can identify and four 
insects in your community. 
6. What are fungi? 
7. Name six kinds of fungi. 
8. What are bacteria? Spores? 
9. Mention three methods of combating smuts and rusts. 
10. Explain three ways of preventing the growth of fungi. 
11. Give the life history of the cotton boll weevil. 
12. How do plant lice feed? 
13. What method may be used for killing plant lice? 
